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550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1)

If you are using Outlook Express (OE), Outlook, or Windows Mail, A HELO error ( 550 Access denied - Invalid HELO name (See RFC2821 4.1.1.1) ) can sometimes be generated by leaving the "My server requires authentication" checkbox unchecked. You may need to try checking off this checkbox.